Overshot



March 28, 1933. A. L. HAMPTON OVERSHOT Filed Feb. 26, 1932 w 7 /IL/ 1.z. w 4

Patented Mar. 28, 1933 A'UDREY L. HAMPTON, OF HOUSTON, TEXS ovERsHo'rAppiication fiiea February 28, 1882. serial no. 5e5,27o.

This invention relates to an overshot.

An object of the invention is to provide a tool of the characterdescribed adapted to pass over the upper end of a pipe stuck in a wellbore and to engage the outer surface of said pipe whereby the stuck pipemay be removed.

Another obj ect of the invention is to provide an overshot of thecharacter described embodying novel means whereby the overshot may bereleased from the pipe for'removal from the Well in case the stuok pipecan not be pulled.

With the above. and other objects in view the invention has particularrelation to certain novel features of construction, operation, andarrangement of parts, an example of which is given in this specificationand illustrated in the accompanying drawing, wherein F igure 1 shows aVertical Sectional view of the tool. p

Figure 2 shows a side elevation thereof partly in section, and

Figure 3 shows a cross sectional view taken on the line 3-3 of F igure1.

In the drawings the numeral 1 designates a tubular body having thedownwardly converging seat 2 therein and whose upper end is providedwith the internal coarse threads 3.

Within the body beneath said seat there is a fiexible packer or cup ring4 which tapers upwardly and which is seated against the inside shoulder5 of the body and retained therein by the annular retainer ring 6.

Screwed into the lower end of the body and abutting the ring 6 there isa guide shoe 'Z whose lower end is flared as at 8 whereby the body maybe guided over the upper end of the stuck pipe 9 as the tool is lowered.

The tool may be attached to the tubular Operating string'lO by means ofa suitable coupling 11.

Within the body there is a tubular operating nipple 12 whose upper endhas a head 13 provided with the external coarse threads 14:

which are in mesh with the threads 3. This nipple is accordingly spacedinwardly from the body 1 and the nipple is provided with one or moreVertical slots 15.

Vertical slots 17 Iextending from-the lower may be removed from thebore.` To assist in Within the body 1 above the seat 2 there V1s a slip16 of a general tub'ular form. The lower end of the slip is providedwith the' end'thereof thus providing the flexible arms 18 and the lowerends of these arms are pro- Vided with the wedge shaped jaws 19 whoseinner sides are toothed and whose outer sides are tapered to confo'rm tothe pitch of the. seat 2. The upper endof the slip has the verticalslots 20 extending to the upper end thereof and preferably arrangedstaggered with the relation to the slots 17 and thus providing thefiexible arms 21.` The upper'ends of these arms 21 have the inwardlyextending studs 22 which project through the slotsV 15. In-assembly thearms 21 may besprung over the lower end of the nipple 12 and thestuds'22 brought into registration 'with the slots 15 whereupon saidstuds Will be pro- 70 jected through said slots` i In use the tool maybe assembled as shown in Figure 1 and let down into the bore and V theguide shoe 7 will guide the tool over the upper end of the stuck pipe. i

The lower end of the shoe 7 may be formed into a wall hook as 23 shownin'Figure 2 se that in case the upper end of the stuck pipe is lyingagainst the wall of the well, the tool may be rotated to'engage the hook23 with the upper end of said pipe to center said upper end in the boreso that the shoe may guide the tool over the upper end of the pipe. Inassembling the tool preparatory to lowering the same into the bore thenipple 12 should be screwed downwardly -on the threadsB so that the jaws19 may seat on the seat 2. As the tool is lowered the jaws 19 willfric'tionally engage the stuck pipe so as to hold the jawsV slightlj,7above the seat 277 the slots 15 being elongated sufiiciently to permitthis.

VVhen the tool has been lowered over the upper en-d of :the stuck'pipean upward pull may then be eXerted through the string 10 and the seat' 2will engage the outer surface of the jaws 19 and will cause said jaws tosecurely grip the pipev to be pulled and a f Vfurther upward pull'mayresult in the dislodgment of the stuck pipe whereupon it m0 dislodgingthe pipe water may be forced uno der pressure down through the string 10and the stuck pipe and return up around the outthis Water will bef-orced, by the packer, or cup ring, 4 to enter Vand pass down throughside of said stuok pipe, whereby said pipe may be Washed loose and maythen be readily removed.

If the pipe 9 is stuck in th-e bore so tightly that it can not bedislodged, it will be nec-essary to release the tool from the pipe toremov-e thev tool. the Operating string and body 1 may be rotated to theright and during this rotation the friction of the jaws 19 with the pipewill hold the nipple 12 stationary, that is, will prevent said nipplefrom turning and the o connection with said body, said slip and nipapipe in a Well, oomprising a tubular body havingadownwardly oonverginginside seat, a tubular slip in said body shape'd to surround the pipeand having engaging jaws Whose outer surfaces taper downwardly andwhose'inner surfaces have pipe engaging teeth, a tubular nipple having athreaded pl'e being provided, one AWith a longitudinal bearing and thelother with a flexible arm having a projection which works in saidbearing. A i

2. An overshot for engaging and pulling i a pipe stuok in a well boreand comprising a tubular body, having a downwardly converging seat, atubularslip in said body adapted to pass over the pipe to be pulled andhaving expanslble pipe gripping jaws carried t-hereby shaped tos'eat in,and to` be contracted by, said seat, flexible arms upstand-V ing' fromthe slip, a tubular slip actuator having a threaded connection with saidbody and an adj ustable connection with said arms, and a yieldablepacker in the body beneath said seat adapted to closely surround saidpipe.

3. An 'overshot for engaging over, and

i pulling, a pipe in'a Well bore, and comprising a tubular body, a slipactuator in, and having a threaded connection with, said body, a tubularslip having' downwardly tapering, contrac'til-e, pipe engaging meansadapted to surround said pipe, a downwardly tapering Z seat in the bodybeneath said engaging means,

flexible arms carried by said slip, operative connections between thearms and sllp actu- In order to release the tool,

ator Whereby said slip may be moved longitudinally in the body upon therotation of the body relative to the slip.

4. An overshot fishing tool comprising a tubular body having adownwardly converging seat therein and whose upper -end is provided withinternal threads, a tubular operating nipple within the body having anexternally threaded enlarged head thereon in mesh With' the threads ofsaid body, a slip Within the body having depending flexible arms andWedge shaped jaws at the lower ends of said arms arranged to becontracted'by saidrseat, fieXible upstanding arms carried by said slipand arranged around the lower end of said nipple, said nipple andupstanding arms being provided one with Vertical slots and the otherwith studs which work in said slots.

In testimony whereof I have signed my name to this specification.

AUDREY L. HAMPTON.

